/** @file
  Common header file for CPU Exception Handler Library.

  Copyright (c) 2012 - 2019, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef _CPU_EXCEPTION_COMMON_H_
#define _CPU_EXCEPTION_COMMON_H_

#include <Ppi/VectorHandoffInfo.h>
#include <Protocol/Cpu.h>
#include <Library/BaseLib.h>
#include <Library/SerialPortLib.h>
#include <Library/PrintLib.h>
#include <Library/LocalApicLib.h>
#include <Library/PeCoffGetEntryPointLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/SynchronizationLib.h>
#include <Library/CpuExceptionHandlerLib.h>

#define  CPU_EXCEPTION_NUM          32
#define  CPU_INTERRUPT_NUM         256
#define  HOOKAFTER_STUB_SIZE        16

//
// Exception Error Code of Page-Fault Exception
//
#define IA32_PF_EC_P                BIT0
#define IA32_PF_EC_WR               BIT1
#define IA32_PF_EC_US               BIT2
#define IA32_PF_EC_RSVD             BIT3
#define IA32_PF_EC_ID               BIT4
#define IA32_PF_EC_PK               BIT5
#define IA32_PF_EC_SS               BIT6
#define IA32_PF_EC_SGX              BIT15

#include "ArchInterruptDefs.h"

#define CPU_STACK_SWITCH_EXCEPTION_NUMBER \
  FixedPcdGetSize (PcdCpuStackSwitchExceptionList)

#define CPU_STACK_SWITCH_EXCEPTION_LIST \
  FixedPcdGetPtr (PcdCpuStackSwitchExceptionList)

#define CPU_KNOWN_GOOD_STACK_SIZE \
  FixedPcdGet32 (PcdCpuKnownGoodStackSize)

#define CPU_TSS_GDT_SIZE (SIZE_2KB + CPU_TSS_DESC_SIZE + CPU_TSS_SIZE)

//
// Record exception handler information
//
typedef struct {
  UINTN ExceptionStart;
  UINTN ExceptionStubHeaderSize;
  UINTN HookAfterStubHeaderStart;
} EXCEPTION_HANDLER_TEMPLATE_MAP;

typedef struct {
  UINTN                       IdtEntryCount;
  SPIN_LOCK                   DisplayMessageSpinLock;
  RESERVED_VECTORS_DATA       *ReservedVectors;
  EFI_CPU_INTERRUPT_HANDLER   *ExternalInterruptHandler;
} EXCEPTION_HANDLER_DATA;

extern CONST UINT32                mErrorCodeFlag;
extern CONST UINTN                 mDoFarReturnFlag;

/**
  Return address map of exception handler template so that C code can generate
  exception tables.

  @param AddressMap  Pointer to a buffer where the address map is returned.
**/
VOID
EFIAPI
AsmGetTemplateAddressMap (
  OUT EXCEPTION_HANDLER_TEMPLATE_MAP *AddressMap
  );

/**
  Return address map of exception handler template so that C code can generate
  exception tables.

  @param IdtEntry          Pointer to IDT entry to be updated.
  @param InterruptHandler  IDT handler value.

**/
VOID
ArchUpdateIdtEntry (
  IN IA32_IDT_GATE_DESCRIPTOR        *IdtEntry,
  IN UINTN                           InterruptHandler
  );

/**
  Read IDT handler value from IDT entry.

  @param IdtEntry          Pointer to IDT entry to be read.

**/
UINTN
ArchGetIdtHandler (
  IN IA32_IDT_GATE_DESCRIPTOR        *IdtEntry
  );

/**
  Prints a message to the serial port.

  @param  Format      Format string for the message to print.
  @param  ...         Variable argument list whose contents are accessed
                      based on the format string specified by Format.

**/
VOID
EFIAPI
InternalPrintMessage (
  IN  CONST CHAR8  *Format,
  ...
  );

/**
  Find and display image base address and return image base and its entry point.

  @param CurrentEip      Current instruction pointer.

**/
VOID
DumpModuleImageInfo (
  IN  UINTN              CurrentEip
  );

/**
  Display CPU information.

  @param ExceptionType  Exception type.
  @param SystemContext  Pointer to EFI_SYSTEM_CONTEXT.
**/
VOID
DumpImageAndCpuContent (
  IN EFI_EXCEPTION_TYPE   ExceptionType,
  IN EFI_SYSTEM_CONTEXT   SystemContext
  );

/**
  Internal worker function to initialize exception handler.

  @param[in]      VectorInfo            Pointer to reserved vector list.
  @param[in, out] ExceptionHandlerData  Pointer to exception handler data.

  @retval EFI_SUCCESS           CPU Exception Entries have been successfully initialized
                                with default exception handlers.
  @retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
  @retval EFI_UNSUPPORTED       This function is not supported.

**/
EFI_STATUS
InitializeCpuExceptionHandlersWorker (
  IN EFI_VECTOR_HANDOFF_INFO       *VectorInfo OPTIONAL,
  IN OUT EXCEPTION_HANDLER_DATA    *ExceptionHandlerData
  );

/**
  Registers a function to be called from the processor interrupt handler.

  @param[in]  InterruptType        Defines which interrupt or exception to hook.
  @param[in]  InterruptHandler     A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
                                   when a processor interrupt occurs. If this parameter is NULL, then the handler
                                   will be uninstalled
  @param[in] ExceptionHandlerData  Pointer to exception handler data.

  @retval EFI_SUCCESS           The handler for the processor interrupt was successfully installed or uninstalled.
  @retval EFI_ALREADY_STARTED   InterruptHandler is not NULL, and a handler for InterruptType was
                                previously installed.
  @retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
                                previously installed.
  @retval EFI_UNSUPPORTED       The interrupt specified by InterruptType is not supported,
                                or this function is not supported.
**/
EFI_STATUS
RegisterCpuInterruptHandlerWorker (
  IN EFI_EXCEPTION_TYPE            InterruptType,
  IN EFI_CPU_INTERRUPT_HANDLER     InterruptHandler,
  IN EXCEPTION_HANDLER_DATA        *ExceptionHandlerData
  );

/**
  Internal worker function to update IDT entries accordling to vector attributes.

  @param[in] IdtTable              Pointer to IDT table.
  @param[in] TemplateMap           Pointer to a buffer where the address map is
                                   returned.
  @param[in] ExceptionHandlerData  Pointer to exception handler data.

**/
VOID
UpdateIdtTable (
  IN IA32_IDT_GATE_DESCRIPTOR        *IdtTable,
  IN EXCEPTION_HANDLER_TEMPLATE_MAP  *TemplateMap,
  IN EXCEPTION_HANDLER_DATA          *ExceptionHandlerData
  );

/**
  Save CPU exception context when handling EFI_VECTOR_HANDOFF_HOOK_AFTER case.

  @param[in] ExceptionType        Exception type.
  @param[in] SystemContext        Pointer to EFI_SYSTEM_CONTEXT.
  @param[in] ExceptionHandlerData Pointer to exception handler data.
**/
VOID
ArchSaveExceptionContext (
  IN UINTN                        ExceptionType,
  IN EFI_SYSTEM_CONTEXT           SystemContext,
  IN EXCEPTION_HANDLER_DATA       *ExceptionHandlerData
  );

/**
  Restore CPU exception context when handling EFI_VECTOR_HANDOFF_HOOK_AFTER case.

  @param[in] ExceptionType        Exception type.
  @param[in] SystemContext        Pointer to EFI_SYSTEM_CONTEXT.
  @param[in] ExceptionHandlerData Pointer to exception handler data.
**/
VOID
ArchRestoreExceptionContext (
  IN UINTN                        ExceptionType,
  IN EFI_SYSTEM_CONTEXT           SystemContext,
  IN EXCEPTION_HANDLER_DATA       *ExceptionHandlerData
  );

/**
  Fix up the vector number and function address in the vector code.

  @param[in] NewVectorAddr   New vector handler address.
  @param[in] VectorNum       Index of vector.
  @param[in] OldVectorAddr   Old vector handler address.

**/
VOID
EFIAPI
AsmVectorNumFixup (
  IN VOID    *NewVectorAddr,
  IN UINT8   VectorNum,
  IN VOID    *OldVectorAddr
  );

/**
  Read and save reserved vector information

  @param[in]  VectorInfo        Pointer to reserved vector list.
  @param[out] ReservedVector    Pointer to reserved vector data buffer.
  @param[in]  VectorCount       Vector number to be updated.

  @return EFI_SUCCESS           Read and save vector info successfully.
  @retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.

**/
EFI_STATUS
ReadAndVerifyVectorInfo (
  IN  EFI_VECTOR_HANDOFF_INFO       *VectorInfo,
  OUT RESERVED_VECTORS_DATA         *ReservedVector,
  IN  UINTN                         VectorCount
  );

/**
  Get ASCII format string exception name by exception type.

  @param ExceptionType  Exception type.

  @return  ASCII format string exception name.
**/
CONST CHAR8 *
GetExceptionNameStr (
  IN EFI_EXCEPTION_TYPE          ExceptionType
  );

/**
  Internal worker function for common exception handler.

  @param ExceptionType         Exception type.
  @param SystemContext         Pointer to EFI_SYSTEM_CONTEXT.
  @param ExceptionHandlerData  Pointer to exception handler data.
**/
VOID
CommonExceptionHandlerWorker (
  IN EFI_EXCEPTION_TYPE          ExceptionType,
  IN EFI_SYSTEM_CONTEXT          SystemContext,
  IN EXCEPTION_HANDLER_DATA      *ExceptionHandlerData
  );

/**
  Setup separate stack for specific exceptions.

  @param[in] StackSwitchData      Pointer to data required for setuping up
                                  stack switch.

  @retval EFI_SUCCESS             The exceptions have been successfully
                                  initialized with new stack.
  @retval EFI_INVALID_PARAMETER   StackSwitchData contains invalid content.
**/
EFI_STATUS
ArchSetupExceptionStack (
  IN CPU_EXCEPTION_INIT_DATA        *StackSwitchData
  );

/**
  Return address map of exception handler template so that C code can generate
  exception tables. The template is only for exceptions using task gate instead
  of interrupt gate.

  @param AddressMap  Pointer to a buffer where the address map is returned.
**/
VOID
EFIAPI
AsmGetTssTemplateMap (
  OUT EXCEPTION_HANDLER_TEMPLATE_MAP  *AddressMap
  );

#endif

